sayee



(No Model.) 7 I 3 Sheets-Sheet 1.

- R. G. SAYER.

RAILWAY GAR BRAKE.

No. 471,849. Patented Mar. 29, 1892;

(No Model.) 3 Sheets-Sheet 2.

R.C.SAYBR.

RAILWAY GAR BRAKE.

No. 471,849. Pafiented Mar. 29, 1892.

(No Model.) 3 Sheets-Sheet a.

R. G. SAY-ER. RAILWAY'GAR BRAKE.

No. 471,849. PatentedMar. 29, 1892,.

we viunms wz ens cb., nunm mgxm, wnnmcran, a c.

UNITED STATES ROBERT COOKE SAYER,

PATENT OFFICE.

OF BRISTOL, ENGLAND.

I RAILWAY-CAR BRAKE.

SPECIFICATION forming part of Letters Patent N0. 471,849, dated March 29, 1892. Application filed September 1,1891. $eria1N0.404,4 21| (No model.)

' To all whom it may concern.-

Be it known that I, ROBERT CooKE SAYER, a subject of the Queen of Great Britain and- Ireland, residing at Redland, Bristol, in the county of Bristol, En gland, have invented certain new and useful Improvements in Brakes for Railway-Vehicles; and I do hereby-dc clare the following to be a full, clear, and ex act description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention for improvements in brakes for railway-vehicles has for its object to utilize the momentum of the vehicles for applying and taking off the brakes when required; and it consists, essentially, in operatingabrake-lever by means of a spiral groove in or a spiral feather on a drum mounted on or driven from.

one of the axles of the vehicle, the said spiral groove or feather terminating at the ends of the drum in plain grooves or feathers, so as to retain the brake-lever in this position until released when once there. The brake-lever is held over the drum by means of an electro-magnet, and when the current to the said magnet is stopped the lever drops onto the drum and is operated. To take off the brakes, a counterweighted or spring-released lever, prevented from acting by stops, is removed by the brake-lever as it reaches the end of its traverse and also by the electromagnet. On again stopping, the current to the magnet falls and raises from off the drum the brake-lever which is forced along inclines to its normal position by springs, the counter weight or spring-released lever being again raised by the motion of the carriage ready to act again.

In the accompanying three sheets of illustrative drawings, Figure 1 is a plan of the under side of a railway-carriage, showing the arrangement of mechanism for applying and taking off the brakes; and Fig. 2 is a sectional side elevation of the same. Fig. 3 is a longitudinal vertical section of the operating mechanism. Fig. 4 is a plan view, and Fig. 5 is a vertical cross-section, of the same. Figs. 6 and 7 are detail views.

The drum a, provided with end grooves a b, united by the spiral groove a a, is fixed upon or forms part of an axle b o, of the vehicle I) and rotates with it. The T-shaped brake-lever a, fulcrumed in the center 0 a of its head 0 bandcarrying'the stud c c for engaging .with the groove 0, a of the drum a, is supported over the drum by the slide (1, passing under its free end and connected to the lever e, fulcrumed at e a and forming the armature of an electro-magnet f. When no current is passing through the magnet f, a spring e 1) draws the lever e away from the der the end of the lever c, which falls onto the drum a, and its stud c c engages with the groove a a and causes the lever c to be moved to one end or the other of the drum, according to the direction of its rotation, to apply the brakes. This motion of the brakelever c is resisted by one or the other of the plate-springs 0 or 0 a, which forces the lever to take a central position over the drum or when the stud c c is raised out of the groove a b. A weighted release-lever h, fulcrumed at h a, is normally supported at its weighted end by a weighted lever Z, fulcrumed at Z a, and whose weight Z Z) forms the armature of a second magnet f, and also by the upper ends or stops of the curved levers 10p a, fulcrumed at p b and connected at their lower ends by a spring p c and by links 10 e to the opposite ends of a lever 19 d. The brake-lever 0 passes between end of the drum it acts on them to open their upper ends against the closing action of the spring p 0, so that the release-lever h is freed from them. If now the current through the magnet m be stopped, the weight Z I) is released and the weighted end of the lever It falls, forcing down also the other end of the lever Z and raising the weight Z Z), the horn or ing the weight from again falling. The other or free end of the lever h is thus raised and raises the saddle 00, and also the cross-bar g and bent rod g a attached to it. The rod 9 a in rising'forces the stud c c of thelevercout of the groove a b, and the spring 0 or 0 athen forces it up on one of the hinged inclines u and over the end onto the slide d, thustaking off the brakes and allowing the upper ends of the levers p p ato be closed by the springp c. The rod gis guided bythe vertical guides g b. It will also be seen that when the current is stopped magnet, and thus draws the slide at from unelectro-magnet m in the same circuit as the the levers p p a, and when forced to either projection h c on the release-lever hpreventfor putting on the brakes the release-lever 7t cannot fall, as it is supported by the levers p p a, and the current is again turned on before the brake-lever arrives at the end of the drum, and so holds it when the levers are withdrawn. The rod 9 also carries at each end two pawls 1 provided with hooks i b, and forced apart'by a spring i a. The hooks t b are situated on opposite sides of the drum n and in close proximity to the end grooves a 0, each of which is provided with a tooth or projection a (1. As the rod 9 is raised when taking off the brakes, the pawls i are also raised and are forced inward by the fixed stops to, so as to come, after the stud c c has cleared the groove a a, in the path of the et pr j c i ns a which lower he pawls i, and t us t e rod 9 and, free endof the release-leverh, raising the weighted end of the lever h, which forces apart in its pas a ain he sp the pp r ends of the levers p p a, which again close 1 and support it, and the weight Z b then falls and causes the leverl to again passu-nder the end of theflever h and also support it, the Weight lb being again held by the magnet m.

I ste d of he d f t r aserl v r h be: ing weighted, it may be attached, as. shown, to one end of a spring h I), attached. at its other end to apin q a, workingin curved slots, qd'in the upper endsOf levers q q a, fulcrumed at g b g b. A loop, a d on the under side of the brake-lever 0 passes between the lower ends of the levers q q a, and when thebrake: lever c is operated acts on one of these ends to lower the upper ends and pin q o and e X, tend the spring h b, so that it can pull down the end' of the release-lever h when released from the lever Z The extremities of the head 0 b. of the lever c are connectedto theslotted links sby means of the slotted links '1" r a, one of which, according to which end of the drum the lever c is forced, operates in ten: sion and: the other is idle. The slotted link 8 s is pivoted to the rocking lever s, f ulcru med at .5 d, and connected to a similar rocking 1e, ver :3 c by the longitudinal rod 36. The rocking levers s. s. c are connected by the tension: links 8. e, and the rocking lever s c by the axis e 1', and levers S a and links 5 e to the transverse brake-rods s g, and thus to the brake-blocks, which are suspended from the vehicle-frame, by the plate-sprin gs t a'tliat assistin taking off the brakes,

What I claim is.-

1. The combination, with the drum; re volved by the motion of the vehicle and pro-.

vided with two circumferential guidesand a spiral guide connecting the two said guides, of a horizontally-vibrating lever adapted to engage with the said guides and to actuate the brake mechanism, substantially as set forth.

2. The combination, with the spirallygroeved drum revolved by the motion of the vehicle, of a horizontally vibrating lever adapted to be operated by-the said drum and to actuate the brake mechanism, and a re grooved actuating-drum and the horizontallyvibratinglever engaging therewith and adapted to operate the brake mechanism, of springs for restoring the said, lever to its central position, the retractible slide for supportingthe,

said lever clear of the drum, the inclined guides for guiding the end ofthe lever onto the said slide, and a pivoted lever provided w t a yo e at one en and adapted:tov raise the aforesaid lever automatically, substantially as and for the purpose setforth.

5. The combination, with the spirallygrooved actuating-drum and the horizontallyvibrating lever c engaging therewith and adapted to operate the brake mechanism, Of a, pivoted lever it, provided at one end with a yoke passing underthe lever c and adapted to raise it automaticallyont of engagement with the said drum, the pivoted levers ar-. ranged in the path of the lever c and adapted to support the lever h, and the electrically controlled lever Z, also adapted to support the said lever h, substantially as and for the purpose set forth.

6, The combination, with the spirallygrooved actuatingdrum and thehorizont-allyvibrating lever 0, provided with a loop, of a pivoted lever it, provided at one end with a yoke passing under the lever c and adapted to raise it out of engagement with the drum, the pivoted levers arranged in the path of the lever c and adapted to support. the lever h, the electrically controlled lever Z, also adapted to support the said lever h, thetwo pivoted levers provided with curved slots and adapted to be operated by the said loop, a pin engaging with the said curved slots, and a spring connected to the said pin and to the other end of the lever h, whereby the said lever h is caused to raise the said yoke When released, substantially as and for th-epurpose set forth.

7. The combination, with the lever c for operating the brake. mechanism, the grooved operating-drum, and the pivotedlever h, provided with a yoke for automatically disen gaging the lever c from the said drum, of two, crossed levers, arranged in the path of the lever c and adapted to, support the. lever 71,, a spring coupling the lower ends of the said crossed levers, a centrally-pivoted lever, andtwo links pivoted to the'lower ends of the said crossed levers and to the opposite ends of the last said lever, whereby the crossed levers are operated simultaneously, substantially as set forth.

8. The combination, with the lever c for operating the brake mechanism, the grooved operatingdrum provided with projecting teeth at its ends, and the pivoted lever h, pro vided with a yoke for automatically disengaging the lever c from the said drum, of the spring-distended hooks connected to one end of the lever h and arranged in the path of 

